Question

Why we use nose not mouth to breath

Answer 1

Because in our nose sticky substance is present called mucus, which purify the air but through mouth all the impurities can enter in our body and can harm us.

Answer 2

we breathe by nose as the hairs present in the nose trap the dust particles and purify the air we breathe. but mouth let go the air with dust particles. so it is harmful to breathe by mouth